From: lasitha <lasitha.ranatunga@...>
Date: 2009-03-02T14:20:14+09:00
Subject: Re: Delegating class methods

On Mon, Mar 2, 2009 at 2:27 AM, Michael Malone
<michael.malone@tait.co.nz> wrote:
> On Mon, Mar 2, 2009 at 2:03 AM, abc <arcadiorubiogarcia@gmail.com> wrote:
>>
>> how would you forward calls from class methods to a class atribute?
>> [...]
>>
>> I have to delegate a fairly large number of calls to an attribute. [...]
>
> class Klass
>  extend Forwardable
>  def_delegators :@object :method1, :method2, :method3
>
>   def initialize
>      @object = SomeKlass.new
>   end
> end

No, that would forward to an instance variable and only work with
Klass instances.

If the OP doesn't mind using a singleton class variable instead of a
class variable [1], then we can still use forwardable:

class Foo
  @hash = {}
  class << self
    extend Forwardable
    def_delegators :@hash, :[], :[]=, :size
  end
end

Foo[:bar] = 'baz'
Foo.size #=> 1

Solidarity,
lasitha

[1] Generally a good idea anyway, right?